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TCA9539-Q1: Decoupling and Unused pin

Part Number: TCA9539-Q1

Hi ,

I am using TCA9539QPWRQ1 this port got i2c to GPIO conversion. I  want to know what should be have to do with unused GPIO  pins?

There is no any suggestion regarding Decoupling capacitor.Can you suggest me for decoupling cap?

I am using 5V DC adapter supply for this .How to do webench Design for this IC?

Is there any app note regarding how to select decap?Please provide link if any.

Thanks

Ashutosh